Transformer case



Jan, 13, 1925.

W. V. MCLIN TRANSFORMER CASE Filed June 4, 1923 Patented Jan. 13, 1925.

UNITED [STATES PATENT, OFFICE.

WALTER v. ncLrN, or Tombo, omo, assreNon. 'ro MODERN ELEc'raIc .MANUFAC- TUBING conm, or romano, omo, a ranruansmr.

TRANBFOBMEB CASE.

Application led June 4, 1923. Serial No. 643,222.

To all 'whom it 'may concer/n:-

.Be it known thatI, IVALTER V.' MCLIN, a citizen of the United States, and a resident of Toledo, in the county of Lucas and State of Ohio, have made an Invention appertaining to a Transformer Case, which invention is fully set forth in the following speci-l fcation. l

.My invention has for its obJect to provide a transformer case which is particularly designed for enclosing a small transformer.`

Such transformers are commonly used in dwelling houses and particularly for modif ing the current of a line circuit to cause t eringing of a bell o r buzzer or other signallin device. The case is preferably forme of porcelain, `andthe invention has for its object to so construct and sha the porcelain case that it may be secured -directly to the wall or ceiling of the building or it may be secured to a terminal box which ma be secured to some part of the building. Where the case is secured directly to some part of the building, the wires, particularly the line wires to the transformer, are so positioned at the point where they enter the case thatthey are located the distance prescribed by the underwriters from the wall or part of the building to which the case is thus directly connected. When the case is secured to a terminal box, such as a knockout box, the line connections may be made in the terminal box and the wires leadin vto the case may be turned into the termina box, the openings through which the wires extend being hooded by the porcellaneous material so as to protect the wires against short circuiting in the .manner also prescribed by the underwriters. Thus Am invention provides an adaptable porcellaneous transformer case to be used in dwelling houses wherein the line wires are rotected-from each other and the part o the buildin to which the case is directly or indirect y connected, as stated above. The case containing the invention may be modied in its details without de arting from the spirit of the invention. o illustrate a practical application of the invention I have selected a porcelain transformer case embodying the invention and shall describe it hereinafter. The case is illustrated in the accompanying drawings.

Figure 1 illustrates a side view, partly in y 1 of the structure.

section, of acase secured directly to a )art of the building, such as a beam or ra t or ceilin Fig. 2 illustrates a top view of thek case s own in Fig. 1. Fig. 3 is a sectional view taken on. the line 3-3 indicated in Fi 2. Fig. 4 is a side view of the case an a terminal box to which the case is connected. Fig. 5 is a sectional view taken on the line 5-5 indicated in Fig. 4.

In Figs. '1, 3, 4 and 5, vl indicates a part of the building in'which the porcelain casev is located. In Figs. 1 and 3 the case 7 is directly connected to the supporting part 1 of the building or structure by means of the screws 2 that pass through openings formed in the flange 3 of the porcelain case. Suitable spacing lugs 4 are formed around the upper edge to permit the proper circulation of air and to space the transformer the required distance from the supporting part lThe line wires 5, leading to the transformer within the case, pass through holes 6. The holes 6 are located a half to three-quarters of an inch from the supportin structure 1 to prevent arcing between t e wires and the supporting part of the structure, and consequentlyl to prevent danger arising b reason of fire that might be caused there om.

Inasmuch as the terminal boxes are used for making connections or branches of connections in a dwelling house, it is often found desirable to secure the porcelain transformercase directly to the terminal boxand use the case in place of the lid that is commonly used to close the terminal box. In Figs. 4 and 5 is shown the ordinary conventional knock-out terminal i Y box 8 having the usual knock-out portions 9 through which branch connections may be made with the main line. The transformer case 7 is connected by screws 10 that ass Aup through the rim or flange 3. The ugs 4 are so formed that` when the transformer case is drawn upwards`by the screwsv 10 the flange 3 will be pressed against the edge of the terminal box 8 and the lugs 4 will be located within the box,

which coacts to prevent shifting of the.

ion

, to thev transformer case; through which thev the Wires 5 may be readilybent. `The open-V ings through `which the Wires 5 pass are" hooded by the'portions 'll of the'porcellaneous material. The hooded portions .11.,

extend from` the flange 3 vand on opposite sides of the recesses into/Which -thefwires' 5 may be bent and up over the openings inlWires` 5 extend,v as lparticularly shown in Fig. '35. n Thus the bend ofthe Wires isprotected Vfrom Contact with ,externalzobjects' WhentlietraT-Jsformer case -is connected to theV terminal box since'the Wires lie Wholly Within the hooded portions ofY the transformer case.' c

The wires leadingto the bell or other sig'-` nalling device may: pass out through the openings'12.r Also the terminal box 8 may be secured to the supporting-structure 1 by any suitable means, such as `by means of the screwsl.

Iclaim:4

l. A transformer .oase having a `flanged rim and openings'through which the leading-in-vvires pass tothe transformer, the

lflange havingrecesses located in proximity to the openings, hooded portions covering the said recesses and openings. j

- 2.A'transformer case having a flanged rim. and openings through which the leadin'g-in-Wirespass to the .transformer, the flange havingrecesses located in yproximity to the openings, hooded portions covering the-,saidrecesses and openings, lugs located on the rim of the transformer case.

3. Av transformer case having a flanged rim and openings through which thelead ing-in-Wires pass' to the transformer, fthe flange having recesses located Vin l proximity to l'the openings, hooded portions covering the said recesses andfopenings, lugs located onthe rim-of the transformercase, means for securing the case to 'a part ofl the building.

4. A transformer case having a flanged rim and openingsy throughfwhich the leading-inewires. pass tothe transformer, the

flange having recesses located in proximity to the openings, hooded yportions covering thesaid "recesses and openings`,f'lugs located on the rim of the transformer case, meansl for securing'theV case 'toa part of the building.V

signed my name fto this Specification.

In testimony .Whereof, I4 have *hereunto*v 

